From a5436d56527515549098fe82c3296bb4c27fedc2 Mon Sep 17 00:00:00 2001
From: Jan Jurzitza <gh@webfreak.org>
Date: Thu, 26 May 2022 09:51:52 +0200
Subject: [PATCH] add `@serdeProxyCast`, `@serdeEnumProxy` UDAs

Implementation is needed on the mir-ion side for use though
---
 source/mir/serde.d | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/source/mir/serde.d b/source/mir/serde.d
index bcd5c7f0..f7cd58c1 100644
--- a/source/mir/serde.d
+++ b/source/mir/serde.d
@@ -13,6 +13,7 @@ module mir.serde;
 
 import mir.functional: naryFun;
 import mir.reflection;
+import std.meta: AliasSeq;
 import std.traits: TemplateArgsOf, EnumMembers, hasUDA, isAggregateType;
 
 version (D_Exceptions)
@@ -653,6 +654,13 @@ version(mir_test) unittest
 +/
 alias serdeGetProxy(alias symbol) = TemplateArgsOf!(getUDA!(symbol, serdeProxy))[0];
 
+/// Can be applied to @serdeProxy types to make (de)serialization use
+/// underlying type through casting. Useful for enums.
+enum serdeProxyCast;
+
+/// Equivalent to @serdeProxy!T @serdeProxyCast
+alias serdeEnumProxy(T) = AliasSeq!(serdeProxy!T, serdeProxyCast);
+
 /++
 Attributes to conditional ignore field during serialization.